Mathcad Plot with an if-statement?

Hi,

First time posting on these forums, been reading around for a couple of years though.

I would like to create a plot of 4 functions (let's say it's different pressures depending on a variable, h). I've done this in the appended example.

However, I would now like to plot only 2 of the functions if a variable, say "condition", is =1.

How can I do this?

I have tried adding an "if" statement on the y-axis of the plot itself, like this:

----

f.1(h) if condition=1

----

, but I get a critical error when doing that, and the plot goes blank.

I'm using MathCad 15.

Any suggestions are appreciated,

Thank you,

Hampus